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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be76afcd2f0ae7a5532fe9f7787a9d28dd8775eb90a0ba769646f186a60443b2' 
  AND token = '2mYE8KJfQAnDnWin/uMBRBqfyL2GNKx6bA78Pw75/b8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}